Gate Driving Circuit Feedback for Uniform Display Scan Signals
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Solution Overview
Problem
Existing display devices experience output characteristic deviations between scan signals due to variations in pixel charge amounts, leading to potential picture quality defects such as horizontal lines, especially under high-temperature conditions or prolonged operation.
Innovation Solution
A gate driving circuit with an overlap gate driving structure and Q node sharing mechanism, coupled with a controller that senses deviations in pixel charge amounts and compensates by adjusting Q node voltages using a sensing reference voltage and Q node control signals to maintain scan signal uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional gate driving circuit is used, then the device complexity is low, but output characteristic deviation between scan signals occurs due to pixel charge amount variations
Solution Approach 1:
The patent implements a feedback mechanism where the sensor detects pixel charge amounts, the controller processes this information to determine deviations, and the Q node voltage is adjusted accordingly to compensate for deviations and maintain uniform scan signal characteristics across all pixels
Solution Approach 2:
The patent introduces a sensor as an intermediary component to detect pixel charge amounts and a controller as an intermediary to process this information and generate Q node control signals, enabling indirect compensation for output characteristic deviations
2Adaptability or versatility
If pixel charge amounts vary, then the device operates under different conditions, but this causes output characteristic deviation leading to picture quality defects
Solution Approach 1:
The patent dynamically changes the Q node voltage parameter based on detected pixel charge amount variations. The controller adjusts the Q node control signal to modify the Q node voltage level, thereby compensating for deviations caused by different operating conditions and maintaining consistent scan signal characteristics
Solution Approach 2:
The patent transitions from a static gate driving circuit to a dynamic system where the Q node voltage can be adjusted in real-time based on sensor feedback. This allows the circuit to adapt to varying pixel charge amounts while maintaining reliable and consistent picture quality
Data Source
AI summary
A display device according to an aspect comprises a display panel that includes a plurality of pixels configured to display an image; a gate driving circuit configured to output respective scan signals to gate lines of the display panel; and a controller configured to (1) determine a deviation between the scan signals applied to the gate lines of the display panel and (2) compensate for the deviation when it is determined that the deviation is greater than a threshold.